Assertion : The cloud in sky generally appear to be whitish.
Reason : Diffraction due to clouds is efficient in equal measure at all wavelengths.
Reason : Diffraction due to clouds is efficient in equal measure at all wavelengths.
Question types
Wave Optics question types
302 questions across 2 question groups — pick any mix to generate a JEE physics paper with step-by-step answer keys.
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Sample Questions
Wave Optics questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
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Assertion : Microwave communication is preferred over optical communication.
Reason : Microwaves provide large number of channels and band width compared to optical signals.
Reason : Microwaves provide large number of channels and band width compared to optical signals.
Assertion : Coloured spectrum is seen when we look through a muslin cloth.
Reason : It is due to the diffraction of white light on passing through fine slits.
Reason : It is due to the diffraction of white light on passing through fine slits.
Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.
Reason : In Young's double slit experiment, fringe width is given by relation $B=\frac{\lambda D}{d}$.
View full solution →Reason : In Young's double slit experiment, fringe width is given by relation $B=\frac{\lambda D}{d}$.
Assertion : Corpuscular theory fails in explaining the velocities of light in air and water.
Reason : According to corpuscular theory, light should travel faster in denser medium than, in rarer medium.
Reason : According to corpuscular theory, light should travel faster in denser medium than, in rarer medium.
Two polaroids are placed in the path of unpolarized beam of intensity $I_0$ such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle $\theta$ with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be
- ✓$\left(\frac{I_0}{8}\right) \sin ^2 2 \theta$
- B$\left(\frac{I_0}{4}\right) \sin ^2 2 \theta$
- C$\left(\frac{I_0}{2}\right) \cos ^4 \theta$
- D$I_0 \cos ^4 \theta$
Answer: A.
View full solution →light wave is travelling along y-direction. If the corresponding $\vec{E}$ vector at any time is along the $x$-axis, the direction of $\vec{B}$ vector at that time is along
- A$y$-axis
- B$x$-axis
- C$+z$-axis
- ✓$-z$ axis
Answer: D.
View full solution →Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is $25.$ The intensities of the sources are in the ratio
- A$25: 1$
- B$5: 1$
- ✓$9: 4$
- D$25: 16$
Answer: C.
View full solution →Two coherent sources of intensities, $l$ and $l$ produce an interferen pattern. The maximum intensity in the interference pattern will be
- A$1+l$
- B$I_1^2+I_2^2$
- C$(I+l)$
- ✓$\left(\sqrt{I_1}+\sqrt{I_2}\right)^2$
Answer: D.
View full solution →Newton postulated his corpuscular theory on the basis of
- ANewton's rings
- BColours of thin films
- ✓Rectilinear propagation of light
- DDispersion of white light
Answer: C.
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